Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 20: Atomic Clusters III (with MO)

A 20.3: Vortrag

Donnerstag, 11. März 2010, 15:00–15:15, F 303

Characteristics of High Energy Velocity Map Imaging (HEVMI) spectrometer designed to study the Coulomb explosion from clusters. — •Slawomir Skruszewicz, Johannes Passig, Andreas Przystawik, Nguyen Xuan Truong, Josef Tiggesbäumker, and Karl-Heinz Meiwes-Broer — Institut für Physik, Universität Rostock, Universitätsplatz 3,18051 Rostock, Germany

Angular resolved photoelectron spectroscopy is a key method to gain deeper insight into the strong-field photoionization and electron dynamics of complex systems, such as multi-electron atoms, molecules, and clusters. A powerful and direct technique for the simultaneous measurement of the energy and angular distribution of the photoelectrons is offered by Velocity Map Imaging spectrometry [1]. The modified five-electrode HEVMI configuration, designed to resolve photoelectrons with kinetic energy up to 1 keV has been tested using the photoionization of Ne atoms with high energy photons (20 - 600 eV) at DESY DORIS III facility. The experimental results prove the applicability of the system to measure photoelectrons with kinetic energy up to 550 eV and created by a continuous radiation sources. As a first application of the HEVMI spectrometer we present results of experiments performed on Ag clusters exposed to intense fs-laser pulses which show anisotropic photoelectron emission [2].

[1] A. T. J. B. Eppink and D. H. Parker, Rev. Sci. Instr. 68, 3447 (1997).

[2] Th. Fennel et al., Phys. Rev. Lett. 98, 143401 (2007).